9-cis-Astaxanthin is an isomer of astaxanthin (3,3 -dihydroxy-ß,ß-carotene-4,4 -dione), belonging to the xanthophyll family of oxygenated derivatives of carotenoids. Synonyms: (3S,3'S, 9-cis)-3,3'-Dihydroxy-beta,beta-carotene-4,4'-dione Molecular Formula: C40H52O4 Molecular Weight: 596.84 Linear...